/*-
 * #%L
 * HAPI FHIR JPA Server
 * %%
 * Copyright (C) 2014 - 2025 Smile CDR, Inc.
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */
package ca.uhn.fhir.jpa.term.loinc;

import ca.uhn.fhir.jpa.entity.TermCodeSystemVersion;
import ca.uhn.fhir.jpa.entity.TermConcept;
import ca.uhn.fhir.jpa.entity.TermConceptParentChildLink;
import ca.uhn.fhir.jpa.term.IZipContentsHandlerCsv;
import ca.uhn.fhir.jpa.term.api.ITermLoaderSvc;
import org.apache.commons.csv.CSVRecord;

import java.util.Map;

import static org.apache.commons.lang3.StringUtils.isNotBlank;
import static org.apache.commons.lang3.StringUtils.trim;

public class LoincHierarchyHandler implements IZipContentsHandlerCsv {

	private Map<String, TermConcept> myCode2Concept;
	private TermCodeSystemVersion myCodeSystemVersion;

	public LoincHierarchyHandler(TermCodeSystemVersion theCodeSystemVersion, Map<String, TermConcept> theCode2concept) {
		myCodeSystemVersion = theCodeSystemVersion;
		myCode2Concept = theCode2concept;
	}

	@Override
	public void accept(CSVRecord theRecord) {
		String parentCode = trim(theRecord.get("IMMEDIATE_PARENT"));
		String childCode = trim(theRecord.get("CODE"));
		String childCodeText = trim(theRecord.get("CODE_TEXT"));

		if (isNotBlank(parentCode) && isNotBlank(childCode)) {
			TermConcept parent = getOrCreate(parentCode, "(unknown)");
			TermConcept child = getOrCreate(childCode, childCodeText);

			parent.addChild(child, TermConceptParentChildLink.RelationshipTypeEnum.ISA);

			parent.addPropertyCoding("child", ITermLoaderSvc.LOINC_URI, child.getCode(), child.getDisplay());

			child.addPropertyCoding("parent", ITermLoaderSvc.LOINC_URI, parent.getCode(), parent.getDisplay());
		}
	}

	private TermConcept getOrCreate(String theCode, String theDisplay) {
		TermConcept retVal = myCode2Concept.get(theCode);
		if (retVal == null) {
			retVal = new TermConcept();
			retVal.setCodeSystemVersion(myCodeSystemVersion);
			retVal.setCode(theCode);
			retVal.setDisplay(theDisplay);
			myCode2Concept.put(theCode, retVal);
		}
		return retVal;
	}
}
